Not a kata issue. Closing.

Look, we can be sure that the "remaining defending power" of d is 4-2=2. The rule about "more points than usual" means that if it was greater than d's usual power (2), we would need to bring it down to 2 before attacking. In this case, it's not greater, so the remaining power stays unchanged and the rule doesn't really change the outcome. Similarly, if sss were attacking, the remaining power of d would stay at 1. That rule makes a difference in cases like attack from a single s. The "remaining defending power" of d would be 4-1=3, but the attacking potential of d is limited at 2.

Any ideas about how I can shortly express this in the description?